So far, I have managed most problems on my own. Sometimes with a little help from knowledgeable people, but now I'm stuck. I am definitely out in "Terra Incognita" when it comes to masonry work.
This is the problem: The house is an old summer cottage, built in 1959. The masonry open fireplace is probably from around the same time.
The problem is that the plinth has settled at some point in the distant past. There is a height difference of about 3 cm on the part of the plinth that has cracked. I've had to put sealant in the crack because the wind was basically blowing straight in there. Cold!!
You can see the crack that I filled with sealant as a dark line on the plinth.
In this picture, you can also see the height difference along the part that "stays in place" on the right and the part that has sunk on the left.
To the question: Now I need to tackle this, but I am terrified of doing something stupid. What I would like to do is simply chisel away the entire plinth downwards, so far that I can either just build up a new smooth cement surface in front of the fireplace. Or, to be able to frame up and lay a new wooden floor there and place a nice copper sheet on top.
Do I risk doing something stupid if I tackle the plinth with a chisel?
Anything I should consider beforehand? Think before acting!
Any practical tips at all?
You have a summer cottage, so it's probably not built on a slab but on a crawl space/pillar foundation while the base of the fireplace stands on the ground by itself, so to speak. The two parts move independently of each other, and that can result in issues like that. You could chisel away everything that is too high and create a new surface, but the problem could return, you need to be prepared for that.
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